EU Trade Commissioner Peter Mandelson has told a Brussels Conference on Sustainable Trade Policy that there are “no simple text book answers” for developing sustainable trade policy, but that the costs and benefits of liberalisation have to be weighed carefully in each case. Citing the example of agricultural and industrial trade in the Doha Round, Mandelson warned against both a simplistic conviction that trade liberalisation brings automatic economic benefits, and the argument that developing countries cannot benefit from more open markets.